I like the Tactical Operator 2...because it has more ventilation holes in the Quad Rail; which would cause it to get less hot, during extended shooting sessions. The muzzle break is effective, though loud. The snow trigger guard is large though the edges are not rounded off --- like Magpul's snow trigger guard. The match grade RR hammer is spindly looking --- and might not hold up to extreme tactical use --- such as a mill-spec hammer would. The RR hammer, will definitely not hold up to use of dedicated 22 rimfire uppers. Check out Brownells new mil-spec AR trigger group.